Metabolic Labeling of Surface Neo-sialylglyconjugates Catalyzed by Trypanosoma cruzi trans-Sialidase

Abstract

Trypanosoma cruzi, the protozoan agent of Chagas disease, has evolved an innovative metabolic pathway by which protective sialic acid (SA) residues are scavenged from host sialylglycoconjugates and transferred onto parasite surface mucin-like molecules (or surface glycoconjugates from host target cells) by means of a unique trans-sialidase (TS) enzyme. TS-induced changes in the glycoprotein sialylation profile of both parasite and host cells are crucial for the establishment of a persistent T. cruzi infection and for the development of Chagas disease-associated pathogenesis. In this chapter, we describe a novel metabolic labeling method developed in our labs that enables straightforward identification and molecular characterization of SA acceptors of the TS-catalyzed reaction.

Epigenetic regulation of Wnt7b expression by the cis-acting long noncoding RNA Lnc-Rewind in muscle stem cells

“…LncRNAs were demonstrated to regulate gene expression at transcriptional, post-transcriptional, or translational level. The function and the mechanisms of action are different and primarily depend on their (nuclear or cytoplasmic) subcellular localization ( Carlevaro et al, 2019 ; Rinn and Chang, 2012 ; Ulitsky and Bartel, 2013 ). A large number of lncRNAs localize inside the nucleus, either enriched on the chromatin or restricted to specific nucleoplasmic foci ( Engreitz et al, 2016 ; Sun et al, 2018 ).…”